Android常用控件之ProgressBar，圆形进度条

目录：android.widget.ProgressBar

前言：中间带百分比的圆形进度条
xml布局

<com.jianshu.CircleProgressView
    android:id="@+id/circleProgressbar"
    android:layout_width="74dp"
    android:layout_height="74dp"
    android:layout_centerInParent="true" />

自定义view：

public class CircleProgressView extends View {
   private static final String TAG = "CircleProgressView";

   private final int mCircleLineStrokeWidth = 8;

   private final int mTxtStrokeWidth = 2;

   // 画圆所在的距形区域
   private final RectF mRectF;

   private final Paint mPaint;

   private final Context mContext;

   private int mMaxProgress = 100;

   private int mProgress = 30;

   private String mTxtHint1;

   private String mTxtHint2;

   public CircleProgressView(Context context, AttributeSet attrs) {
       super(context, attrs);
       mContext = context;
       mRectF = new RectF();
       mPaint = new Paint();
   }

   @Override
   protected void onDraw(Canvas canvas) {
       super.onDraw(canvas);
       int width = this.getWidth();
       int height = this.getHeight();

       if (width != height) {
           int min = Math.min(width, height);
           width = min;
           height = min;
       }

       // 设置画笔相关属性
       mPaint.setAntiAlias(true);
       mPaint.setColor(Color.rgb(0xe9, 0xe9, 0xe9));
       canvas.drawColor(Color.TRANSPARENT);
       mPaint.setStrokeWidth(mCircleLineStrokeWidth);
       mPaint.setStyle(Paint.Style.STROKE);
       // 位置
       mRectF.left = mCircleLineStrokeWidth / 2; // 左上角x
       mRectF.top = mCircleLineStrokeWidth / 2; // 左上角y
       mRectF.right = width - mCircleLineStrokeWidth / 2; // 左下角x
       mRectF.bottom = height - mCircleLineStrokeWidth / 2; // 右下角y

       // 绘制圆圈，进度条背景
       canvas.drawArc(mRectF, -90, 360, false, mPaint);
       mPaint.setColor(Color.rgb(0xf8, 0x60, 0x30));
       //矩形、开始角度、扫过角度、是否实心、画笔
       canvas.drawArc(mRectF, -90, ((float) mProgress / mMaxProgress) * 360, false, mPaint);

       // 绘制进度文案显示
       mPaint.setStrokeWidth(mTxtStrokeWidth);
       String text = mProgress + "%";//百分比
       int textHeight = height / 4;
       mPaint.setTextSize(textHeight);
       int textWidth = (int) mPaint.measureText(text, 0, text.length());
       mPaint.setStyle(Paint.Style.FILL);
       //居中文字计算
       canvas.drawText(text, width / 2 - textWidth / 2, height / 2 + textHeight / 3, mPaint);

       if (!TextUtils.isEmpty(mTxtHint1)) {
           mPaint.setStrokeWidth(mTxtStrokeWidth);
           text = mTxtHint1;
           textHeight = height / 8;
           mPaint.setTextSize(textHeight);
           mPaint.setColor(Color.rgb(0x99, 0x99, 0x99));
           textWidth = (int) mPaint.measureText(text, 0, text.length());
           mPaint.setStyle(Paint.Style.FILL);
           canvas.drawText(text, width / 2 - textWidth / 2, height / 4 + textHeight / 2, mPaint);
       }

       if (!TextUtils.isEmpty(mTxtHint2)) {
           mPaint.setStrokeWidth(mTxtStrokeWidth);
           text = mTxtHint2;
           textHeight = height / 8;
           mPaint.setTextSize(textHeight);
           textWidth = (int) mPaint.measureText(text, 0, text.length());
           mPaint.setStyle(Paint.Style.FILL);
           canvas.drawText(text, width / 2 - textWidth / 2, 3 * height / 4 + textHeight / 4, mPaint);
       }
   }

   public int getMaxProgress() {
       return mMaxProgress;
   }

   public void setMaxProgress(int maxProgress) {
       this.mMaxProgress = maxProgress;
   }

   public void setProgress(int progress) {
       this.mProgress = progress;
       this.invalidate();
   }

   //非UI线程调用
   public void setProgressNotInUiThread(int progress) {
       this.mProgress = progress;
       this.postInvalidate();
   }

   public String getmTxtHint1() {
       return mTxtHint1;
   }

   public void setmTxtHint1(String mTxtHint1) {
       this.mTxtHint1 = mTxtHint1;
   }

   public String getmTxtHint2() {
       return mTxtHint2;
   }

   public void setmTxtHint2(String mTxtHint2) {
       this.mTxtHint2 = mTxtHint2;
   }
}